Which control system uses a feedback device to verify motion?

Which control system uses a feedback device to verify motion?

• A. Closed-loop system
• B. Open-loop system
• C. Manual control
• D. Direct drive system

Answer: (A)

Closed-loop control uses feedback to verify motion. In this setup, sensors continuously measure the actual position or movement and send that information back to the controller. The controller compares the measured motion with the commanded value and automatically corrects any difference, keeping motion on target even if loads or friction change. This feedback loop is what allows precise verification and adjustment of position during machining and threading. Open-loop systems move to a set position without checking the result, so there’s no automatic correction if the motion is off. Manual control relies on a human operator to guide movement and lacks automatic feedback. Direct drive describes how the motor is connected to the load rather than whether feedback exists; it can be used in either closed- or open-loop configurations.

Closed-loop control uses feedback to verify motion. In this setup, sensors continuously measure the actual position or movement and send that information back to the controller. The controller compares the measured motion with the commanded value and automatically corrects any difference, keeping motion on target even if loads or friction change. This feedback loop is what allows precise verification and adjustment of position during machining and threading.

Open-loop systems move to a set position without checking the result, so there’s no automatic correction if the motion is off. Manual control relies on a human operator to guide movement and lacks automatic feedback. Direct drive describes how the motor is connected to the load rather than whether feedback exists; it can be used in either closed- or open-loop configurations.